eigrp
hello: periodically multicast, identifies neighbors, forms adjacency
update: sent only for change event, to multicast 224.0.0.10 in link cost. sends unicast upon new neighbor discovery
ack: acknowledgement of an update
query: query of neighbor routes (after 16 attempts at multicast, unicast is then sent
reply: (unicast) answers query
ospf
hello: discover, build and mantain adjacencies, sent to 224.0.0.5
dbd: a summary of the lsdb; used to verify like lsdb between neighbors
lsr: requests link state information from neighbor
lsu: sends requested link state information
lsack: reliable acknowledgement
they are not so different...
network cisco ccna gns3 certification arteq
a network runs through it
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